I suspect I will be flamed for this post!
Hopefully, we are on a pathway to bring back single sex provision. My vision is that for provision such as GG, there will be similar male only and mixed sex provision so there is something for everyone.
In the meantime, there is an almighty mess to fix. I have empathy for leaders who have vulnerable young boys in their packs. Some of these young boys will be very vulnerable and the leaders will know them and their vulnerabilities well. It may be the case that some have emotionally based school non attendance issues, self harm or eating issues, and GG is a positive factor in helping them overcome these. I think leaders and guides will find it very upsetting to see these boys removed from their pack.
Its possible to believe that GG should not include males, that existing males need to be excluded, and also recognise that this will be difficult for the leaders, the boys, and some of the girls who are friends with the boys. I can understand them having a strong emotional reaction when discovering the policy change.
As others have pointed out, the problem was making GG mixed sex. The ideology that drove this has been nothing but damaging.